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Old 11-22-2018, 09:40 AM   #1
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Rear lighting issue/wiring diagram - 1995 Amtran Genesis

Does anyone have any info, or a wiring diagram for the rear lights? We're having issues with the tail lights and we need to get them functioning so we can get our bus from freezing MN to somewhere south where we can finish it and then rewire if needed.

All front lights function as usual (head lights, turn signals, etc.)

Rear turn signals function as usual.

Driver's side red lights - always on high as if the brakes are being pressed, even when the bus isn't running but key is 'on' or 'aux power' position. Brakes do not need to be pressed for these light to think the brakes are on.

Both passenger red lamps functions as brake lights when brakes are pressed but do not light as running/tail light.

We've checked grounds that we could find and traced wires etc. we could find but not sure what we could be missing.

We don't necessarily need the running/tail lights to function, we can drive during daylight hours only if needed. We just need the brakes lights to function so we can legally drive it on the highway.

Any advice you could give us is greatly appreciated. Thanks in advance for your help.
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Old 11-22-2018, 09:51 AM   #2
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Brake lights being on such as yours are would appear to me to be a brake switch issue firstly. At the top of the brake pedal arm the switch can be adjusted to adjust the play in it. Sounds like yours is making all the time so you would allow more gap so it only activates when the brake pedal is pushed.
Air brake setup might be different, you didn't say which you have.
Tail lights out. Could be just dirty sockets. Replace if old but check for power first from a fused feed. Might even be a problem with the switch that turns them on if not in the headlight switch.
Good luck and let us know what you find.



John
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Old 11-22-2018, 12:54 PM   #3
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Thanks BlackJohn, and Happy Thanksgiving!

We have hydraulic brakes - so we have that kind of brake switch...but could a bad brake switch have lights working correctly on one side and not the other? Driver's side are bright all the time, passenger light up only when the brake is depressed - so they work correctly.
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Old 11-22-2018, 02:34 PM   #4
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Check everything you can see on the driver side. Wires good? Any splices bad etc.
Good ground connection of the whole socket and metal body of the same to ground.
That is likely the difference in how the sides are working different. The left has poor ground.


Is the bulb on the left the same type and number as the right?
Cleanliness of mating surface of the socket and bulb is often overlooked and gets one where you are, not that you have done anything. Something to clean while you open it up to check things.
Socket too body mounting holes often rust away so best check that. Sometimes the screws loosen after the years so maybe just tighten it all up first.


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Old 11-22-2018, 03:14 PM   #5
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followed wires...

followed the wires again - this drawing shows JUST the tail light wires and where they go. There is a second wire coming from the driver's tail light that goes to trailer wiring harness and another that has a plug, in line, that wasn't attached to anything.
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Old 11-22-2018, 03:47 PM   #6
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Disconnect the wiring from the solenoid to the whole socket on the right in the diagram. This will eliminate one feed.


The left side appears to have another feed.

I'm thinking from the brake switch only now, which to me seems normal.



Can't explain why that wire is there from a 12v solenoid and connected as such. Certainly constitutes a second feed.



Check operation after this change you just made.


Do you intend to keep the trailer wire and the other nothing socket?

If not, cut and tape them off there for now but cut them longish so you have something to work with later if need be.


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Old 11-22-2018, 03:47 PM   #7
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Wires are good, connections are good.

Entire bus was stripped of siding and it's all new galvanized steel (not painted yet, definitely not rusted yet). Passenger light was good but driver side was rusted so cleaned up and painted with rustoleum this summer. Probably need to get rid of some of the paint to make sure it's grounded? Will check bulbs for type and number. Thanks for more places to look. Appreciate it.
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Old 11-22-2018, 11:29 PM   #8
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Check and make sure the bulb isn't in backwards, the "brake" filament is not on the "running" lights side. Fairly common thing with the old 1157 type bulbs.
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Old 11-23-2018, 03:04 PM   #9
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detached from solenoid...

Cleaned driver's side bulb, fixture, wires, grounds, made sure in correctly etc. - still on as brakes all the time.

So...removed the wiring to the solenoid and the driver's side now does nothing. Passenger still lights when brake depressed - good.

Tried grounding the wire I removed from the solenoid - still nothing at all on driver's side. Passenger side still good.
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Old 11-23-2018, 03:30 PM   #10
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Engine: Cat 3116
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Do a voltage test on the right and then feed the left with that source.
Do a voltage test on the driver side, anything?

Why are you grounding the solenoid wiring? isn't it still "hot" but disconnected from the passenger side? Are you sure it is from the solenoid?
How did you prove that?


You will have to determine which wire go from side to side and to the proper socket.



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